From the testimony of SS-Unterscharfuehrer Wilhelm Bahr in his trial at Hamburg[Quoted in “Truth Prevails”, ISBN 1-879437-00-7, p. 99].
Q: Is it correct that you have gassed 200 Russian POW’s with Zyklon-B?
A: Yes, on orders.
Q: Where did you do that?
A: In Neuengamme [concentration camp].
Q: On whose order?
A: The local doctor, Dr. Von Bergmann.
Q: With what gas?
A: With Prussic acid [another name for Zyklon-B].
Q: How long did the Russians take to die?
A: I do not know. I only obeyed orders.
Q: How long did it take to gas the Russians?
A: I returned after two hours and they were all dead.
Q: For what purpose did you go away?
A: That was during lunch hour.
Q: You left for your lunch and came back afterwards?
Q: Were they dead when you came back?
Q: Did you look at their bodies?
A: Yes, because I had to load them.
Q: Why did you apply the gas to the Russians?
A: I only had orders to pour in the gas and I do not know anything about it.